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Date: Tue, 5 Jul 2011 17:29:16 +0000 (UTC)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HADOOP-7090) Possible resource leaks in hadoop
 core code
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     [ https://issues.apache.org/jira/browse/HADOOP-7090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE updated HADOOP-7090:
-------------------------------------------

     Component/s: io
                  fs/s3
    Hadoop Flags: [Reviewed]

+1 patch looks good.

> Possible resource leaks in hadoop core code
> -------------------------------------------
>
>                 Key: HADOOP-7090
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7090
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs/s3, io
>    Affects Versions: 0.21.0, 0.23.0
>            Reporter: Gokul
>            Assignee: Uma Maheswara Rao G
>         Attachments: HADOOP-7090.0.patch, HADOOP-7090.patch
>
>
> It is always a good practice to close the IO streams in a finally block.. 
> For example, look at the following piece of code in the Writer class of BloomMapFile 
> {code:title=BloomMapFile .java|borderStyle=solid}
>     public synchronized void close() throws IOException {
>       super.close();
>       DataOutputStream out = fs.create(new Path(dir, BLOOM_FILE_NAME), true);
>       bloomFilter.write(out);
>       out.flush();
>       out.close();
>     }
> {code} 
> If an exception occurs during fs.create or on any other line,  out.close() will not be executed..
> The following can reduce the scope of resorce leaks..
> {code:title=BloomMapFile .java|borderStyle=solid}
>     public synchronized void close() throws IOException {
>       super.close();
>       DataOutputStream out = null;
>       try{
>           out = fs.create(new Path(dir, BLOOM_FILE_NAME), true);
>           bloomFilter.write(out);
>           out.flush();
>       }finally{
> 	 IOUtils.closeStream(out);
>     }
> {code} 

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